= A =
Alice and Bob
aliasing bug n.
A class of subtle programming errors that
can arise in code that does dynamic allocation, esp. via
malloc(3) or equivalent. If several pointers address
(`aliases for') a given hunk of storage, it may happen that the
storage is freed or reallocated (and thus moved) through one alias
and then referenced through another, which may lead to subtle (and
possibly intermittent) lossage depending on the state and the
allocation history of the malloc arena. Avoidable by use of
allocation strategies that never alias allocated core, or by use of
higher-level languages, such as LISP, which employ a garbage
collector (see GC). Also called a stale pointer bug.
See also precedence lossage, smash the stack,
fandango on core, memory leak, memory smash,
overrun screw, spam.
Historical note: Though this term is nowadays associated with
C programming, it was already in use in a very similar sense in the
Algol-60 and FORTRAN communities in the 1960s.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.